List of workers needing uniform (4)
I believe the answer is:
menu
'list' is the definition.
(menu is a kind of list)
'workers needing uniform' is the wordplay.
'workers' becomes 'men' (man is a kind of worker).
'needing' means one lot of letters go next to another.
'uniform' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.).
'men'+'u'='MENU'
'of' is the link.
(Other definitions for menu that I've seen before include "restaurant guide" , "Choice of dishes" , "List of items to choose from as in restaurant" , "List of fare" , "List of dishes on offer" .)